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Qualifiers are additions and extensions to the metadata elements and give metadata creators the option to refine the meaning or add precision.
For example, it may be of benefit to the user to know that a given date refers to when an item was amended as opposed to when it was first made available. It can be useful to know that the date entry is encoded using a particular convention, or that a term has been selected from a particular list of terms ('controlled vocabulary').
Qualifiers consist of two types;
and
Qualifiers are not mandatory except when using the Date element.
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